In recent years, many fishermen working in the bay scallop ponds have had poor results. In addition to being affected by climate change, the main reasons for this are technical operations. To increase the economic benefits of keeping seedlings in ponds, emphasis should be placed on improving the quality of seedlings and the survival rate of seedlings, and pay attention to the following points:
First, the bottom of the shrimp pond is a soft mud bottom, and the pool edge is to be compacted, otherwise, the pool water will be easily turbid in case of strong wind and plug the seedling bag mesh. The area of ​​shrimp ponds must be matched with the number of seedlings. If the seedling density is too small, resources will be wasted and the density will be too large, resulting in a shortage of feed during the later period. A good pool of water and fertilizer can increase the growth rate of scallops, and the survival rate and seedling maintenance rate also increase. Generally, the transparency of the pool water is about 40 centimeters. The water color is yellow-brown and yellow-green. The dominant species of food are Chaetoceros, Diamond-shaped algae, Skeletonema, Cylindroa, Chlorella. If there is excessive dinoflagellate, it should be timely. Change the water or change the pond.
Second, juvenile exit time should not be too early. After the juveniles enter the shrimp pond, the water temperature stays below 13°C for a long time and is not stable. The shellfish metabolism is low and the growth is slow. If it is detached, the reattachment is difficult. In the event of cold air activity, the juveniles are in a closed shell, affecting growth and survival.
Third, we must choose good quality juveniles. Attention should be paid to inquire about the source specifications of seedlings, probiotics, incubation time, cultivation conditions, drug use, feeding species, and other issues, combined with microscopic examination, visual observation, swing test, cooling test, etc., to check the attachment of beetle seedlings, feeding, vitality, Specifications and other indicators, comprehensive evaluation of juvenile seedling quality.
Fourth, the seedling bags should be hung in a low light water layer of 30 cm to 40 cm. The seedling bag floating mud should be promptly washed to promote the water quality inside and outside the bag and the bait should be exchanged fully. Brush bag is best to use a large tube brush or long hair hard brush, one to wash the mud on the bag completely clean; the second is to plug the mesh hole debris, in order to increase the water inside and outside the seedling bag exchange. Traditionally, brushing and light washing with a soft brush is difficult to brush through the mesh. This is the current practice of seedlings in the shrimp pond is too careful, resulting in poor exchange of water in the seedling bag, and it is difficult for the bait and dissolved oxygen to meet the needs of scallop larvae. Therefore, the main reason for the corresponding reduction in seedling maintenance rates. Bags are bagged in time to relieve the crowded, polarized, and weakened constitution of the seedlings in the seedling bags. The second is the long-term backlog of shellfish seedlings in the plastic pots. The drying time is too long and the seedlings are long. Time cannot be re-dispersed to the seedling bag.
Fifth, from the third day of juveniles entering the pool, once a day early, changing the amount of water to 10% is appropriate, in the middle and late period, about 20% is appropriate. Changing water can not only prevent water quality from aging, maintain relatively stable water temperature, but also form water flow and promote the exchange of water in seedling bags. According to the weather conditions, in the rainy days, the water level of the pond should be increased as much as possible, and the seedling bags should be reduced to prevent the mutation of surface water pool salinity from causing the juveniles to adapt or even die. In the first 3 days of seedling separation, pool water exchange should be strengthened, and the amount of water exchanged can be more than 30%, so that the environmental conditions of the pool water and the water environment of the natural sea area are close to each other, so as to increase the adaptability of juveniles when they go to sea.
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